Request to change Minecraft server version to Paper 1.20.1

[DragonT]

Note - If you do not fill in every section below, your post won’t be answered - you must provide the steps you have followed so far and the actions you’ve already taken. Make sure to remove this notice from your post too.

Screenshots of text are prohibited. Always copy and paste text as text.

Make sure you search before posting! Duplicate posts for the same issue may not be answered.

OS Name/Version:Hostinger Game Panel (AMP-based, managed environment)

Product Name/Version: (Always use the full version number - not ‘Latest’)
Minecraft Game Panel 4 – Default server template starts on 1.21.8

Problem Description:
I would like to run my server on Paper 1.20.1 (build 196) instead of the latest 1.21.8.
However, the Game Panel always forces the server to run on 1.21.8.
Even if I replace the JAR file manually, the system automatically restores the original 1.21.8 JAR with hash verification.
There seems to be no option in the panel to select an older Paper version or to set a custom JAR path.

If you're sharing console output, logs, or commands you have run, please make sure to use code tags 
(3x backticks for blocks, 1x backtick for a single line) to help make posts readable. This also
provides syntax highlighting.

Steps to reproduce:

• 1. I purchased the Game Panel 4 plan on Hostinger for hosting a Minecraft server.
  2. I created a new instance (novx01) in the Game Panel.
  3. By default, the server always started on Minecraft version 1.21.8.
  4. I tried to downgrade to Paper 1.20.1 (build 196):

     • Downloaded the Paper JAR file.

     • Uploaded it through the File Manager.

     • Renamed it to server.jar.

     • Also tried replacing the file inside versions/1.21.8/.

  5. However, every time I restarted the instance, AMP/Game Panel automatically restored 1.21.8 (with hash check).
  6. I checked the Instance Deployment and Container Settings, but there was no option to change the executable JAR path or select an older version template.
  7. At this point, it seems my Game Panel does not allow Custom JAR execution.

Actions taken to resolve so far:

• Replaced server JAR manually in root and versions folder.

• Renamed the Paper JAR to match expected filenames (server.jar, server-1.21.8.jar).

• Explored all Game Panel settings (Instance Deployment, Container Settings) to find JAR selection or version control.

• Verified that no “Custom JAR” option is available in my panel.

Request:
Please confirm whether the Hostinger Game Panel supports Custom JAR execution or older Paper templates.
If possible, enable Paper 1.20.1 support for my instance, or provide instructions on how to properly configure the panel to run this version.

[Greelan]

Double click on the instance to manage it, then go to Configuration > Minecraft > Server